原地重熔及其地质效应

The In-situ-melting Model of Granite Origin and Its Geological Evidence

传统岩浆侵入模型已无法容纳与花岗岩有关的各种地质、地球化学资料 .与侵入模型不同 ,近年提出的原地重熔说视上陆壳为封闭系统而不是开放系统 .该假说认为 ,花岗岩的形成实质是系统内部的物质随着熵的变化而从有序 (原始岩石 )到无序 (熔浆 ) ,再到新的有序 (花岗岩 )的过程 .文章着重介绍原地重熔的基本原理及重熔过程引起的部分地质效应 ,包括岩基的空间、岩基的大小与形态、捕掳体和暗色包体、岩体与围岩的“侵入接触”关系、“花岗岩背斜”以及花岗岩内的流动构造等 .

A model concerning granite origin referred to as in_situ melting has been advanced in the last several years by the first author, which regards the upper crust as a close system and the granite as the result of materials within system changing from order (protolith) to disorder (melts) and finally to new order (granite with the variations of entropy. This paper gives a brief introduction of the model, and on the basis explains the various geological phenomena resulted by the melting process, including the room of batholiths, the generation of xenoliths and enclaves, the contact relations of granite bodies and their country-rocks, the formation of granite anticlines.